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//===--- UndefinedMemoryManipulationCheck.cpp - clang-tidy-----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "UndefinedMemoryManipulationCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
namespace {
AST_MATCHER(CXXRecordDecl, isNotTriviallyCopyable) {
// For incomplete types, assume they are TriviallyCopyable.
return Node.hasDefinition() ? !Node.isTriviallyCopyable() : false;
}
} // namespace
void UndefinedMemoryManipulationCheck::registerMatchers(MatchFinder *Finder) {
const auto NotTriviallyCopyableObject =
hasType(ast_matchers::hasCanonicalType(
pointsTo(cxxRecordDecl(isNotTriviallyCopyable()))));
// Check whether destination object is not TriviallyCopyable.
// Applicable to all three memory manipulation functions.
Finder->addMatcher(callExpr(callee(functionDecl(hasAnyName(
"::memset", "::memcpy", "::memmove"))),
hasArgument(0, NotTriviallyCopyableObject))
.bind("dest"),
this);
// Check whether source object is not TriviallyCopyable.
// Only applicable to memcpy() and memmove().
Finder->addMatcher(
callExpr(callee(functionDecl(hasAnyName("::memcpy", "::memmove"))),
hasArgument(1, NotTriviallyCopyableObject))
.bind("src"),
this);
}
void UndefinedMemoryManipulationCheck::check(
const MatchFinder::MatchResult &Result) {
if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("dest")) {
QualType DestType = Call->getArg(0)->IgnoreImplicit()->getType();
if (!DestType->getPointeeType().isNull())
DestType = DestType->getPointeeType();
diag(Call->getBeginLoc(), "undefined behavior, destination object type %0 "
"is not TriviallyCopyable")
<< DestType;
}
if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("src")) {
QualType SourceType = Call->getArg(1)->IgnoreImplicit()->getType();
if (!SourceType->getPointeeType().isNull())
SourceType = SourceType->getPointeeType();
diag(Call->getBeginLoc(),
"undefined behavior, source object type %0 is not TriviallyCopyable")
<< SourceType;
}
}
} // namespace bugprone
} // namespace tidy
} // namespace clang
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